f4Sxbhzi

1/*
2 * To change this license header, choose License Headers in Project Properties.
3 * To change this template file, choose Tools | Templates
4 * and open the template in the editor.
5 */
6
7package pod;
8import java.nio.charset.StandardCharsets;
9import javax.crypto.Cipher;
10import javax.crypto.spec.SecretKeySpec;
11/**
12 *
13 * @author Lukasz
14 */
15public class AdvancedEncryptionStandard {
16
17    private byte[] key;
18
19    private static final String ALGORITHM = "AES";
20
21    public AdvancedEncryptionStandard(byte[] key)
22    {
23        this.key = key;
24    }
25
26    /**
27     * Encrypts the given plain text
28     *
29     * @param plainText The plain text to encrypt
30     */
31    public byte[] encrypt(byte[] plainText) throws Exception
32    {
33        SecretKeySpec secretKey = new SecretKeySpec(key, ALGORITHM);
34        Cipher cipher = Cipher.getInstance(ALGORITHM);
35        cipher.init(Cipher.ENCRYPT_MODE, secretKey);
36
37        return cipher.doFinal(plainText);
38    }
39
40    /**
41     * Decrypts the given byte array
42     *
43     * @param cipherText The data to decrypt
44     */
45    public byte[] decrypt(byte[] cipherText) throws Exception
46    {
47        SecretKeySpec secretKey = new SecretKeySpec(key, ALGORITHM);
48        Cipher cipher = Cipher.getInstance(ALGORITHM);
49        cipher.init(Cipher.DECRYPT_MODE, secretKey);
50
51        return cipher.doFinal(cipherText);
52    }
53
54    /**
55     * @param args the command line arguments
56     */
57    public static void main(String[] args) throws Exception {
58        // TODO code application logic here
59        byte[] encryptionKey = "MZygpewJsCpRrfOr".getBytes(StandardCharsets.UTF_8);
60        byte[] plainText = "Hello world!".getBytes(StandardCharsets.UTF_8);
61        AdvancedEncryptionStandard advancedEncryptionStandard = new AdvancedEncryptionStandard(
62             encryptionKey);
63        byte[] cipherText = advancedEncryptionStandard.encrypt(plainText);
64        byte[] decryptedCipherText = advancedEncryptionStandard.decrypt(cipherText);
65
66        System.out.println(new String(plainText));
67        System.out.println(new String(cipherText));
68        System.out.println(new String(decryptedCipherText));
69    }
70    
71}